Little Cohas Brook Dam
Key Takeaway
Little Cohas Brook Dam is classified as low hazard in New Hampshire. It was completed in 1953 and is 73 years old. Its primary use is recreation.
Physical Details
| Dam Height | 10 ft (taller than 16% in NH) |
| Dam Length | 70 ft |
| Dam Type | Concrete |
| Max Storage | 867 acre-ft |
| Normal Storage | 39 acre-ft |
| Surface Area | 17 acres |
| Drainage Area | 7 sq mi |
| Max Discharge | 1,011 cfs |
| Year Completed | 1953 (73 years old) |
| Year Modified | 1988 |
| NID ID | NH00509 |
Safety Information
No probable loss of human life and low economic/environmental losses expected.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
NH DOT
State Government
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High Hazard 27 ftFrequently Asked Questions
What is the hazard classification of Little Cohas Brook Dam?
Little Cohas Brook Dam is classified as Low Hazard. No probable loss of human life and low economic/environmental losses expected. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Little Cohas Brook Dam?
Little Cohas Brook Dam is owned by NH DOT (State Government). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Little Cohas Brook Dam built?
Little Cohas Brook Dam was completed in 1953, making it 73 years old. Many U.S. dams were built between the 1930s and 1970s during a period of major infrastructure investment.
What is the primary purpose of Little Cohas Brook Dam?
Little Cohas Brook Dam serves the following purposes: Recreation. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Little Cohas Brook Dam?
Little Cohas Brook Dam has a dam height of 10 ft. Dam height is measured from the natural streambed at the downstream toe to the top of the dam, and may differ from the visible height.
When was Little Cohas Brook Dam last inspected?
Little Cohas Brook Dam was last inspected on October 17, 2022. Inspection dates indicate when a formal review occurred, not the results of that inspection.